Tuesday, December 29, 2009

Tilt sensors

New digital tilt indicators
Converts inclinometer output to display angle, with a resolution as low as to 0.001°

Sherborne Sensors has announced the launch of the DTI series, a family of 5-digit, programmable digital panel meters, offering improved tilt measurement system versatility and performance.

The DTI series is designed to take an output from any of their gravity referenced inclinometer, provide the necessary trigonometric conversions, and display the output as an angle, with a resolution down to 0.001°. For seamless interface with a data acquisition system, two supplementary outputs, an analog voltage output and a RS422/485 serial output, are supplied. The enclosure is manufactured from recyclable and flame retardant (VO) materials, with front panel conformance to IP65: NEMA 4.

Because of its versatility, the DTI Series can be effectively implemented into simple, measurement-only applications, as well as those requiring digital communications, alarms and mathematical functions. The powerful menu-driven software, also supplied, enables fast and flexible set-up from the front panel or via serial communications link. In addition, built-in, comprehensive alarm functions for the DTI Series makes them particularly suitable for monitoring, switching and control functions. The hysteresis facility prevents noisy signals from switching alarms erroneously, with high and low deviations facilitating control around a set point. On and off delay times can be set with individual alarms, configured as latching or non-latching, depending on user requirements.

The DTI Series is suitable for use with most of their gravity-referenced inclinometers, as well as other manufacturers' products. An integral 12 VDC power supply is intended to provide excitation voltage for MEMS- based inclinometers. Bi-polar voltage supplied inclinometers may be also powered via Sherborne Sensors XT-0102 or XT-0103 series power supply modules. For customer convenience, the DTI Series can also be supplied as a completely calibrated tilt monitoring system, including the inclinometer.

Flight test

Airborne amplifiers for flight test applications

Endevco® has launched a new series of compact, lightweight, rugged airborne amplifiers, designed for use within demanding flight test applications.

Operating from an onboard aircraft DC-power source, these airborne amplifiers are designed for use with piezoelectric microphones and accelerometers. The 2680M-XXX is a charge amplifier, offering dual outputs, one biased and the other, unbiased, both of which are adjustable with a common gain control. Units are available with an optional low-pass filter. Endevco® model 2685V is a voltage amplifier for use with ISOTRON® (IEPE) accelerometers, providing a constant current power source to a transducer’s integral electronics, while maintaining a two-wire connection. The unique hybrid microcircuit construction of both the 2680M-XXX and 2685V series allow them to be offered in a rugged, compact package, with low power consumption. Units have an output voltage proportional to input acceleration or sound. Amplifier sensitivity is not significantly affected by input cable capacitance. Use of modular construction techniques permits great versatility in gain and filter choices.

Accelerometers recommended for use with the series 2680M-XXX and 2685V airborne amplifiers include model 7255A Pyrotron accelerometer; model 2271A/AM20 cryogenic accelerometer; the thru-bolt mounted model 2221F accelerometer, which recently commemorated its 6,000th successful field installation; and the model 2510 piezoelectric microphone.